23 Trick Flow pays contingency in the IHRA on all Trick Flow cylinder heads and intake manifolds. 1807DRTF Some parts are not legal for sale or use on any pollution-controlled motor vehicles. Win Big. Trick Flow’s PowerPort® 365 aluminum cylinder heads were designed and built for you to win races. These extreme performance race heads for big block Chevy engines flow a massive 424 cfm @ .900" lift. The high-strength castings can withstand enormous amounts of compression and RPM. Rectangular-shaped 365cc CNC Competition Ported runners, 119cc heart-shaped chambers, CNC bowl blended valve seat transitions, 24° intake valve angles with 4° side cants, and the highest quality valvetrain components help make PowerPort 365 heads the best choice for your car. Use PowerPort 365 heads on your engine and turn your goal of winning into reality! Dyno Results PowerPort 365 Test Engine: 13.86:1 compression 572 c.i.d. with Trick Flow PowerPort® 365 cylinder heads (TFS-4141T804-C02), solid roller camshaft (285°/298° duration @ .050"; .900"/.828" lift; 114° lobe separation), 1.8/1.7 ratio shaft mount roller rocker arms, Trick Flow R-Series intake manifold (TFS-41400111), Holley Gen 3 Ultra Dominator 1,425 cfm carburetor, Trick Flow by Stainless Works headers (TFS-DBBC238250), 3½" dual exhaust with Flowmaster mufflers, Q16 racing fuel.